I'm talking about something even more internal than that, but that's good point. The proverbial "Tyranny of the Barline".
As we know, phrasing is not so, necessarily, bound by barlines. In Jazz improvisation, one is freer from this rigidity but it applies to "classical" music, as well. A simple example (sorry, I don't know how to create and post my own graphics) is an eighth-note at the end of a bar. We can look at many note groupings and say, that's the end of the phrase, banging a metrical phrase interpreted as barline downbeats. But is it that, or a pick-up note into the next phrase?
Marcel Tabuteau was a master of phrasing and wrote, The Art of Phrasing which is brilliant. Any musician wanting to expand his/her phrasing possibilities and, hence, gain better, more sophisticated, musicianship should read it. This is a good time to do that.
A good alternative is Note Grouping by James Thurmond, which is based on the theories of Tabuteau and others but is expressed differently
.
Good point, Dr GO.